Mixing-furnace for iron-foundries.



' No 895,029. PATENTBD AUG. 4, 1908.

J. S. KENNEDY & J. B. NAU. MIXING FURNACE FOR IRON POUNPRIES.

APPLICATION FILED MAR. 26, 1907.

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PATBNTED AUG. 4, 1908. J. S. KENNEDY & J. B. NAU. MIXING FURNACE FOR IRON POUNDRIES.

APPLICATIOE FILED MAR. 26, 1907.

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' UNITED sT-A'rns IiATENT OFFICE;

, JOHN s KENNEDY, or STANHOPE, NEW JERSEY, mo mm B. no, or NEW YonK, Y.

MIXING-FURNACE FOR mON-FOUNDRIES.

Specification of Letters Patent.

Patented Aug. 4, 1908.

T all whom it may concern:

Be it known that we, JOHN S. Kin-imam,

residing at Stanhope, in the county of Sussex and Slat-e of New Jersey, and Jonx B. NAU, residing at New York, in the county of New York and State of New York, have invented certain new and uscful improvements in MixingQlr-umaces for Iron-Foundries, whereof the following is a specification, reference being had to the accompanying drawings.

in said drawings, Figure 1. represents a transverse vertical section through the furnace, 'ulicating in a: partial sectional view certain adjacent parts. H, is a longitudinal vertical section through the furnace on the lines II, ll, of Fig. I. Fig. III, is a sectional plan view of the furnace on the lines lll, lll, of Figs. I, and II.

The object of our invention is to provide for use in foundries a mixing furnace of a type adapted to foundry practice as distinguished from the mixers which have heretofore been used in connection with steel works for the manufacture of the steel itself. Mixers of this last mentioned ty .e are necessarily of lar ,9 capacity, as huncreds of tons are asse through them every twenty-four ours. In consequence of their roqui cments 8. highly complicated and costly structure is necessary, the use of which would he prohilwitive in connection with the ordinary foundry practice, where the quantities of the iron dealt with are much smaller and the conditious of use othc wise different.

To meet the ends ahovc noted We have devised a mixer which of a novel type, in that it is stationary, as distinguished from tilting, and also in other features about to be describcd. Among these the following in ay he noted as prominent: The stationary mixer is adapted to rcccivc iron directly from the lilast furnoce, in relatively large units, as compared with inc mnts of withdrawal, {ll-- though upon a scale much smaller than that which is characteristic of the tilting mixers heretofore used. B-lc'ans are also afforded for conveniently adding to the metal of the limb, inc-fol from other sources; for protecting illb hat-h as for as possible against oxidation during the mixing period while maintaining lzemperaturc; and for permitting n13 Withdrawal of the contents of the bath in relatively small unit-s from selected and differcnr levels. The general system therefore comprises, in addition to the furnace proper,

regencrative'hot blast apparatus, whereby the temperature may he maintained at a suitable point by the action of flame upon the metal. But-certain features of our invenrains.

Referring to the figures,1 indicates the hearth of the stationary mixing furnace, and tho top and side walls thcreof. The hearth and sides are of such dimensions and configuration as to afford a relatively short 3 and deep hath, as compared with the corrcsponding features of the bath in ordinary o ion-hearth furnaces. The floor or bottom of the hearth is covered with a lining of refractory brick, the use. of which material is essential for a bath having the relatively short and deep dimensions indicated.

The numerals 3, 4, 5, and 6, indicate the flu for providing the necessary lame circulotion; said ilues conununicating in the usual manner with the regenerators 7, and 8,

conventionally indicated in Fig. I.

At 2. point preferably midway of the greatestlength of the furnace arclallvely largo Wall, said opening having a door or gate 12. Adjacent. to said opening is an opening 13, provided with a conducting trough 14, adapted to receive metal from the blast furnace, so as to facilitate charging in relatively large units. These openings are both arranged, as shown. above the normal level of the bath within the furnace. On the oppositc side of the. furnace, we provide alurality of superposed tap-holes indicate at 17, 1S, and 19, having: respectively doors 20, 21, and 22, and spouts or nozzles 23, 24, and these tsp-holes icing of a size to facilitate tlm discharge 0" the. contents of the hath in relatively small units 1 As ill be noted, the opening 18, is at the extreme. bottom of the both, while the openlugs 17, and 19, are located at'varying height-s above this region, so that the contents may he limped at any selected level, to obtain the motel characteristic of the region of such level.

The doors or gates of the various charging and discharging openings may be of any doenter into any details-d description thereof. The olgecfof our invent-ion 1s, sis-before metal capped from .a blast furnace in relation are not essentially dependent upon thc' use of such specihc form of heating appawhose stack 9, and controlling valves are charging opening 11, is located in the side' sired character, and it is not necessary to stat-or. 20 mix and control the character of tively large unit-s, permitting the treatment.

to comprise the addition of other ingredients, such as cold pig iron, scrap, etc.

The flame to be employed is, asfar as possible, a neutral one in order to avoid oxidation or undue refining of the metal.

We are of course aware that the use of a mixing furnace is not broadly new, and We do not claim the same. f

The organization attained by our invention difiers however, from previous devices of the same general class in that it is a stationary type and in the eouliar character and configuration of the nace, as well as in the provision of ad'unctive devices which permit complete wit drawal of the bath itself and facilitate the withdrawal of selected portions of its contents.

Having thus described our invention, we claim:

1. A stationary mixing-furnace having a relatively short and deep hearth provided with a closed top, said hearth having a charging aperture and a plurality of tap-holes arranged at' different levels; and means for controlling said charging aperture and said tap-holes.

2. A stationary mixing-furnace havin a relatively short and deep hearth provided, with a closed top,- said hearth having a 3Q charging aperture and a plurality of tapholes arran ed at difierent levels; and means for contro g said charging aperture and said tap-holes, in combination with regenerative heating apparatus communicating with the interior of said hearth. i

In testimony whereof, we have hereunto. signed our' names, in the presence of two subscribing witnesses.

' JOHN S. KENNEDY.

JOHN B. NAU.

Witnesses as to John S. Kennedy:

M. T. THOMAS, J. FRANK BEST. 

